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  • 1
    Digitale Medien
    Digitale Medien
    Interfacial reactions and thermal stability of ultrahigh vacuum deposited multilayered Mo/Si structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4072-4077 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Interfacial reactions and thermal stability of ultrahigh vacuum deposited multilayered Mo/Si structures have been investigated by high resolution transmission electron microscopy in conjunction with fast Fourier transform and autocorrelation function analysis. For samples with nominal atomic ratios Mo:Si=1:2 and 3:1, well defined multilayered Mo/Si structures were obtained after annealing at 250 °C for 30 min. On the other hand, distinct multilayered MoSi2/Si structure was formed only for Mo:Si=1:2 samples after annealing at 650 °C for 1 h. Multiphases were observed to simultaneously form in samples annealed at 400–500 °C. After 600 °C annealing for 1 h, tetragonal MoSi2 was the only silicide phase observed for the Mo:Si=1:2 samples, whereas both tetragonal and hexagonal MoSi2 were present in Mo:Si-3:1 samples. The stability of the multilayered Mo/Si structures was found to depend critically on the atomic ratios of constituent elements, bilayer period, and annealing conditions. The results are interpreted in terms of the delicate balance among intermixing of constituent atoms, silicide formation, and crystallization of silicon. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361835
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  • 2
    Digitale Medien
    Digitale Medien
    Bulk superconductivity with Tc (zero) up to 95 K in a Tl0.5Pb0.5Ca0.9Ce0.1Sr2Cu2 oxide with an Y1Ba2Cu3Oy-like structure (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2464-2466 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Bulk superconductivity with Tc (zero) up to 95 K in a Tl0.5Pb0.5Ca0.9Ce0.1Sr2Cu2 oxide with an Y1Ba2Cu3Oy -like structure was observed. Single-phase samples, tetragonal in structure with a=0.380±0.001, c=1.195±0.001 nm, and of P4/mmm space group, were prepared. The results represent the first case where Ce substitution significantly raised the Tc of a known compound. The samples were remarkably homogeneous both in composition and structure. The compounds were highly reproducible and stable. The preparative conditions were found to be much less stringent than those of other copper-based high Tc superconductors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101536
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  • 3
    Digitale Medien
    Digitale Medien
    Structural and microstructural characterization of a high Tc superconducting BiSrCaCu oxide (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 913-915 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The crystal structure and microstructures of a high Tc BiSrCaCuO (BSCCO) compound were characterized by transmission electron microscopy, x-ray diffraction (XRD), and energy dispersive spectrometry (EDS). Convergent beam electron diffraction (CBED) analysis established that the crystal is of mm2 symmetry. Combined with electron diffraction, XRD, and EDS data, the high Tc superconducting BSCCO compound was found to be of the Pnn2 space group, orthorhombic in structure with a=0.540 nm, b=2.689 nm, and c=3.040 nm and with an approximate composition of Bi2Sr2CaCu2Oy. Diffraction contrast analysis indicated that the dislocations are predominantly of screw character with [010] or [001] Burgers vectors. However, edge type dislocations and dislocations with [100] Burgers vector were also observed. The magnitude of the Burgers vector along the [100] direction was determined to be 1/2 [100] by high-resolution lattice imaging. Stacking faults and small-angle grain boundaries were frequently observed. The presence of a high density of defects in the superconducting oxide may facilitate the processing of the material and serve as effective flux line barriers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100157
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  • 4
    Digitale Medien
    Digitale Medien
    Direct conversion of superconducting Y2Ba4Cu7O15−δ from YBa2Cu3O7−x at atmospheric pressure in an O2 ambient (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2142-2144 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Direct conversion of superconducting Y2Ba4Cu7O15−δ (Y-247) from YBa2Cu3O7−x (Y-123) was achieved at atmospheric pressure. The Y-247 samples were synthesized by the reactions of Y-123 and Cu-(NO3)2 at 860 °C in an O2 ambient. The results strongly suggest that Y-247 is a thermodynamically more stable phase than Y-123 at the atmospheric pressure. The conversion also provides a novel and simple route to synthesize the Y-247 compound.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104157
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  • 5
    Digitale Medien
    Digitale Medien
    Resistive, magnetic, and structural studies of Tl0.5Pb0.5(Ca1−xMx)Sr2Cu2Oy compounds with M equal to the natural mixture of rare-earth elements (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2029-2031 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the resistivity, structural, and magnetic susceptibility measurements for Tl0.5Pb0.5(Ca1−xMx)Sr2Cu2Oy superconductors with M equal to the natural mixture of rare-earth elements and x=0, 0.05, 0.1, 0.2, and 0.3, respectively. The powder x-ray diffraction profile indicates a single-phase, P4/mmm tetragonal crystal structure with a=0.380±0.002 nm and c=1.205±0.002 nm for a Tl0.5Pb0.5(Ca0.9M0.1)Sr2Cu2Oy superconductor. Tc (zero)'s were found to be 79, 91, 101, 97, and 87 K for x=0, 0.05, 0.1, 0.2, and 0.3, respectively. Hc1 of Tl0.5Pb0.5(Ca0.9M0.1)Sr2Cu2Oy was estimated to be around 1.8 kG at 5 K, and Jc about 1.35×103 A/cm2 with a 20 kG applied field at 5 K. The Meissner signal of this sample indicates the Tc onset ∼100 K, and the mass diamagnetic susceptibility −χg at 5 K is 2.52×10−3 cm3/g (field cooled at 100 G).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102339
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  • 6
    Digitale Medien
    Digitale Medien
    Structural characterization of a TlCaBaCu oxide in Tc onset=155 K and Tc zero=123 K superconducting specimens (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1434-1436 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The crystal structure of a Tl-Ca-Ba-Cu-O compound in Tc onset=155 K and Tc zero=123 K superconducting specimens was characterized by transmission electron microscopy. Convergent beam electron diffraction analysis established that the phase is of P4/mcc space group. The lattice parameters of the phase were determined to be a=b=0.394 nm and c=3.95 nm. The phase was found to be primarily of a ten-subcell structure by both high-resolution lattice imaging and diffraction pattern analysis. The composition of the grains with the ten-subcell structure being predominant was measured by energy dispersive spectrometry to be TlCa2Ba3Cu4Ox. Polytypes of the phase with four- and five-subcell structures were also observed. The five-subcell structure was identified to be of P4/mmm space group with a=b=0.394 nm and c=1.97 nm. The compositions of the specimens were measured to vary in composition ratios of Tl, Ca, Ba, and Cu from 1:2:2:3 to 1:2:3:4. The results strongly suggested that the TlCa2Ba3Cu4Ox phase is a high Tc superconducting phase with an exciting possibility that superconducting transition occurs at 155 K for this phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100459
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  • 7
    Digitale Medien
    Digitale Medien
    Structural and microstructural characterization of a high-Tc superconducting YBaSrCu3O7−δ compound (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3593-3597 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Transmission electron microscopy (TEM), energy dispersive analysis of x ray (EDS), x-ray diffraction, electrical resistance, and magnetic susceptibility measurements were applied to characterize the structure and microstructures of a high-Tc superconducting YBaSrCu3O7−δ compound. The sintered samples were found to be predominantly of a single phase with a modified perovskite structure. Combined EDS/TEM and high-resolution lattice imaging with computed image simulation data showed that the atomic ratio of Sr and Ba atoms is about unity and Ba sites in YBa2Cu3O7−δ compound were partially substituted by Sr atoms in the three-layer perovskite structure, in agreement with the results of a previous neutron diffraction study. It was also found that the marked contrast difference in high-resolution images along [100] and [010] directions of the high-Tc oxygen-deficient superconducting crystals can be used to advantage to distinguish [100] and [010] directions of the modified perovskite structure in TEM. Lattice defects such as twins and dislocations were observed and analyzed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341394
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  • 8
    Digitale Medien
    Digitale Medien
    Autocorrelation function analysis of phase formation in the initial stage of interfacial reactions of molybdenum thin films on (111)Si (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1224-1226 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Autocorrelation function (ACF) analysis has been applied to the high resolution transmission electron microscope images of amorphous interlayers formed in the interfacial reactions of ultrahigh vacuum deposited molybdenum thin films on (111)Si. Mo3Si was identified to be the first nucleated crystalline phase which is correlated to the stable structure of the amorphous Mo-Si alloy. Both Mo3Si and Mo5Si3 were found to form simultaneously under certain annealing conditions. The results demonstrate the usefulness of the ACF analysis of atomic images in amorphous interlayers formed in the initial stage of reactions in metal thin films on silicon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.110846
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  • 9
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    MiR-181a confers resistance of cervical cancer to radiation therapy through targeting the pro-apoptotic PRKCD gene (2013)
    Nature Publishing Group (NPG)
    In: Oncogene
    Details
    Publikationsdatum: 2013-06-21
    Beschreibung: MiR-181a confers resistance of cervical cancer to radiation therapy through targeting the pro-apoptotic PRKCD gene Oncogene 32, 3019 (20 June 2013). doi:10.1038/onc.2012.323 Authors: G Ke, L Liang, J M Yang, X Huang, D Han, S Huang, Y Zhao, R Zha, X He & X Wu
    Schlagwort(e): miR-181aPRKCDapoptosiscervical cancerradiation therapy
    Print ISSN: 0950-9232
    Thema: Medizin
    Publiziert von Nature Publishing Group (NPG)
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  • 10
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    Brk/PTK6 sustains activated EGFR signaling through inhibiting EGFR degradation and transactivating EGFR (2012)
    Nature Publishing Group (NPG)
    In: Oncogene
    Details
    Publikationsdatum: 2012-10-05
    Beschreibung: Brk/PTK6 sustains activated EGFR signaling through inhibiting EGFR degradation and transactivating EGFR Oncogene 31, 4372 (4 October 2012). doi:10.1038/onc.2011.608 Authors: X Li, Y Lu, K Liang, J-M Hsu, C Albarracin, G B Mills, M-C Hung & Z Fan
    Schlagwort(e): EGFRBrkCblSrcbreast cancer
    Print ISSN: 0950-9232
    Thema: Medizin
    Publiziert von Nature Publishing Group (NPG)
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